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16182500A

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0970CGas Cylinder ScaleInstallation and ServiceManual

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Mettler-Toledo, Inc. 2001

No part of this manual may be reproduced or transmitted in any form or by any means, electronic ormechanical, including photocopying and recording, for any purpose without the express written permission

of Mettler-Toledo, Inc.

U.S. Government Restricted Rights: This documentation is furnished with Restricted Rights.

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INTRODUCTION

This publication is provided solely as a guide for individuals who have received Technical Training inservicing the METTLER TOLEDO product.

Information about METTLER TOLEDO Technical Training can be obtained by writing, calling, or faxing:

METTLER TOLEDO

1900 Polaris Parkway

Columbus, Ohio 43240 USAphone: (614) 438-4511

fax: (614) 438-4958www.mt.com

WARNING!

This equipment generates, uses, and can radiate radio frequency energy and, if not installed and usedproperly, i.e., in accordance with the instructions manual, may cause harmful interference to radio

communications. It has been tested and found to comply with the limits for a Class A computing device,pursuant to Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protectionagainst such interference when operated in a commercial environment. Operation of this equipment in a

residential area is likely to cause interference to radio communications, in which case the user at his ownexpense will be required to take whatever measures may be required to correct the interference.

METTLER TOLEDO RESERVES THE RIGHT TO MAKE REFINEMENTS ORCHANGES WITHOUT NOTICE.

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Precautions

WARNINGPERMIT ONLY QUALIFIED PERSONNEL TO SERVICETHIS EQUIPMENT. EXERCISE CARE WHEN MAKINGCHECKS, TESTS, AND ADJUSTMENTS THAT MUST BEMADE WITH POWER ON. FAILING TO OBSERVE THESEPRECAUTIONS CAN RESULT IN BODILY HARM.

WARNING

FOR CONTINUED PROTECTION AGAINST SHOCKHAZARD, CONNECT TO PROPERLY GROUNDED OUTLETONLY. DO NOT REMOVE THE GROUND PRONG.

WARNING

DISCONNECT ALL POWER TO THIS UNIT BEFOREINSTALLING, SERVICING, CLEANING, OR REMOVING THEFUSE. FAILURE TO DO SO COULD RESULT IN BODILYHARM AND/OR PROPERTY DAMAGE.

CAUTIONBEFORE CONNECTING/DISCONNECTING ANY INTERNAL ELECTRONICCOMPONENTS OR INTERCONNECTING WIRING BETWEEN ELECTRONICEQUIPMENT, ALWAYS REMOVE POWER AND WAIT AT LEAST 30 SECONDS.FAILURE TO OBSERVE THESE PRECAUTIONS COULD RESULT IN BODILY HARM ORDAMAGE TO OR DESTRUCTION OF THE EQUIPMENT.

CAUTIONOBSERVE PRECAUTIONS FOR HANDLINGELECTROSTATIC SENSITIVE DEVICES.

WARNINGIF USED IN A HAZARDOUS AREA, THE HAZARDOUSAREA MUST BE MADE SAFE PRIOR TO INSTALLATION,REPLACEMENT, OR TROUBLESHOOTING. FAILURE TOCOMPLY COULD RESULT IN PERSONAL INJURY,DEATH, AND/OR PROPERTY DAMAGE.

READ this manual BEFOREoperating or servicing this

equipment.

FOLLOW these instructionscarefully.

SAVE this manual for futurereference.

DO NOT allow untrained

personnel to operate, clean,inspect, maintain, service, ortamper with this equipment.

ALWAYS DISCONNECT thisequipment from the powersource before cleaning or

performing maintenance.

CALL METTLER TOLEDO for parts,

information, and service.

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Contents

1 Introduction.......................................................................................................1-10970C Gas Cylinder Scale.................................................................................................. 1-1

Model Number.................................................................................................................... 1-2

Power Supply Requirements................................................................................................ 1-2

Load Cell Specifications...................................................................................................... 1-3

Approvals........................................................................................................................... 1-3

Dimensions........................................................................................................................ 1-5

2 Inspection and Site Selection .............................................................................2-1Inspection.......................................................................................................................... 2-1

Site Selection..................................................................................................................... 2-1

3 Installation........................................................................................................3-1General Guidelines ............................................................................................................. 3-1

Installation......................................................................................................................... 3-1

Calibration......................................................................................................................... 3-2

4 Routine Care and Maintenance ...........................................................................4-1General.............................................................................................................................. 4-1

Site Inspection ................................................................................................................... 4-1

Scale Inspection ................................................................................................................. 4-1

5 Troubleshooting ................................................................................................. 5-1General.............................................................................................................................. 5-1

Isolate the Problem ............................................................................................................ 5-2

Check Wiring...................................................................................................................... 5-2

Check Load Cell ................................................................................................................. 5-3

Check Mechanical Components ........................................................................................... 5-3

Load Cell Replacement Procedure ....................................................................................... 5-4

6 Service Parts ..................................................................................................... 6-1

0970C Gas Cylinder Scale.................................................................................................. 6-2

7 Reference Material ............................................................................................ 7-1Reference Drawings............................................................................................................ 7-1

Recommended Spare Parts ................................................................................................. 7-1

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Chapter 1: Introduction0970C Gas Cylinder Scale

(3/01) 1-1

1 Introduction

0970C Gas Cylinder

ScaleThe Model 0970C scale is designed for weighing gas cylinders that exert a distributed

load while centered on the upper loading plate. It consists of a 250-kg torsion ring loadcell attached to a mounting plate (bottom) and a loading plate (top). A mounting bolt

transfers weight from the loading plate to the load cell. A set screw is located at eachcorner of the scale to protect the load cell against overloading.

Figure 1-1: Model 0970C Gas Cylinder Scale

This manual explains how to install and service Model 0970C gas cylinder scales. Ifany information is incorrect or missing from the manual, please use the Publication

Suggestion Report at the back of the manual to tell us about it.

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METTLER TOLEDO 0970C Gas Cylinder Scale Installation and Service Manual

(3/01)1-2

Model NumberTable 1-1 shows how the model number is configured for a Model 0970C gas cylinder

scale (0970C1X2401).

Model Number Configuration

XXXX X X XX X -XX

Model Weigh Module

Type

# of Modules Load Cell Capacity Metrology Custom Sequence

0970 C = Custom 1 X2 = 250 kg 4 = C3 Ex,5Kd NTEP, FM

01 = Gas Cylinder Scale

Table 1-1: Load Cell Configuration

Power Supply

RequirementsA METTLER TOLEDO digital indicator is used to power the analog load cell in a Model

0970C gas cylinder scale. Refer to the digital indicators service manual for theindicators power requirements.

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Chapter 1: IntroductionLoad Cell Specifications

(3/01) 1-3

Load Cell

SpecificationsModel: RLC

Capacity (Emax

): 250 kg

Rated output (RO): 1.75 mV/V

Maximum excitation voltage: 30 VDC maximum

Input terminal resistance: 1,100 50 ohms

Output terminal resistance: 1,025 50 ohms

Sealing: Hermetically sealed, IP66 and IP68

Material: Stainless steelCable length: 5 meters (16.5 feet)

Temperature range (compensated): -10C to +40C(+14F to +104F)

Safe side load: 100% of Emax

Safe overload: 150% of Emax

Combined error (linearity andhysteresis):

0.02% of rated output

Zero balance: 1.5% of rated output

ApprovalsOIML Certification

Model RLC load cells meet or exceed OIML requirements for R60 C3 3000 divisions.

Ex Approval

Model RLC load cells have European Approval for use in hazardous areas. Approval is

to EEx ib IIC T6 (certification number Ex-94.C.2142).

Factory Mutual Approval

Model RLC load cells have Factory Mutual entity approval for use in hazardous areas.

Refer to Figure 1-2 for the control drawing.

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(3/01)1-4

Figure 1-2: Control Drawing for RLC Load Cell

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Chapter 1: IntroductionDimensions

(3/01) 1-5

Dimensions

Load Cell

CapacityA B C D E

250 kg 235 mm(9.25 inches)

13 mm(0.5 inch)

10 mm(0.375 inch)

51 mm(2.0 inches)

1 mm(0.0625 inch)

Table 1-2: 0970C Gas Cylinder Scale Dimensions

A

A

B

C

D E

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Chapter 2: Inspection and Site SelectionInspection

(3/01) 2-1

2 Inspection and Site Selection

InspectionWhen you receive your scale, inspect the packing container and scale for freightdamage. Inspect the following:

1. Load cell and suspension assembly

2. Load cell cable

3. Platform assembly and overload stop screws

If you find damage, contact your freight carrier immediately.

Site SelectionInstallation problems are often caused by inappropriate site conditions. Before installingthe scale, make sure the site meets the following criteria:

The support surface of the cabinet or other structure on which the scale will be

installed should be level.

The cabinet or other structure must be strong enough to support a fully loadedscale.

No heavy vibrations or wind currents at or near the scale.

No excessive or unusual loading caused by the site or equipment.

Access to the load cell for service.

A location near the scale to mount the indicator.

If the site meets the criteria listed here, proceed with the installation. Otherwise, make thenecessary adjustments before installing the scale.

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Chapter 3: InstallationGeneral Guidelines

(3/01) 3-1

3 Installation

General Guidelines

WARNINGIF USED IN A HAZARDOUS AREA, THE HAZARDOUSAREA MUST BE MADE SAFE PRIOR TO INSTALLATION,REPLACEMENT, OR TROUBLESHOOTING. FAILURE TO

COMPLY COULD RESULT IN PERSONAL INJURY,DEATH, AND/OR PROPERTY DAMAGE.

Do Not Cut the Load Cell Cable

Cutting the load cell cable will affect compensation and void the warranty.

Protect the Load Cell from Damage

Load cells can be damaged if too much weight is placed on them. To protect theload cells, the scale has an overload stop at each corner. The overload gaps areset at the factory and should be maintained at the factory setting: 1/16" (1 mm).

Figure 3-1: Overload Stop Gaps

InstallationThe 0970C gas cylinder scale is delivered fully assembled. The following instructionsexplain how to set it up and connect it to a scale indicator.

1. Remove all packing material from the scale.

2. Position the scale on the cabinet or other structure where it will be used.

Make sure that the loading plate faces upward. This is the square plate with the

jam nut located in the center of it (see Figure 3-1).

Make sure that the surface of the loading plate is level. Adjust the cabinet or

support structure to level the plate if necessary.

Overload Gap1/16" (1 mm)

Overload Gap1/16" (1 mm)

Loading PlateJam Nut

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(3/01)3-2

Make sure the loading plate does not touch any surrounding structure.

Make sure that there is room to route the load cell cable to where the indicator

will be mounted. The load cell cable should not be pulled tight and should notbe pinched by the scale assembly or surrounding structures.

3. Connect the load cell cable to the terminals inside the scale indicator according tothe wiring codes shown in Table 3-1.

Note:The load cell is supplied with a standard length of cable (5 meters). Do not

lengthen or shorten load cell cables in the field! Changing the length of a load cell

cable will affect compensation and void the warranty.If a cable is too long,

simply coil the excess cable and place it near the scale indicator. Nonstandardlengths of cable can be ordered for applications that require them.

Load Cell Connection to Indicator

Function Load Cell Wire Color

+ Excitation Pink

+ Sense*

+ Signal Brown

Shield Bare

- Signal White

- Sense*

- Excitation Gray

*The load cell does not have a +Sense or Sense wire. You will need to jumper theindicators +Sense terminal to its +Excitation terminal and jumper its Sense

terminal to its Excitation terminal.

Table 3-1: Wiring Codes

4. Form a drip loop in the cable so that water will not run down the cable onto theload cell or indicator.

CalibrationOnce the scale has been installed and wired, calibrate it according to the instructions inthe manual for the scale indicator.

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Chapter 4: Routine Care and MaintenanceGeneral

(3/01) 4-1

4 Routine Care and Maintenance

GeneralOnce you have installed your scale, you should have an authorized METTLER TOLEDOservice representative periodically inspect and calibrate it. If the scale is used for legal-for-trade purposes, consult the local weights and measures authorities for minimum

inspection requirements. Contact your local authorized METTLER TOLEDO servicerepresentative for information about periodic inspection and calibration services.

Site InspectionMake sure that the scale site remains in good condition. Check for the following:

Overloading or excessive vibration

Build-up of debris or material under or around the scale that could prevent the scale

from moving freely

Scale InspectionDuring periodic inspections of the scale, check the following:

Signs of unusual wear to the load cell or loading plate

Binding between the loading plate and surrounding structure

Load cell cable: Is it damaged? Does it bind the scale?

Repeatability of the scale

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Chapter 5: TroubleshootingGeneral

(3/01) 5-1

5 Troubleshooting

General

WARNINGPERMIT ONLY QUALIFIED PERSONNEL TO SERVICETHIS EQUIPMENT. EXERCISE CARE WHEN MAKINGCHECKS, TESTS, AND ADJUSTMENTS THAT MUST BEMADE WITH POWER ON. FAILING TO OBSERVE THESEPRECAUTIONS CAN RESULT IN BODILY HARM.

CAUTIONBEFORE CONNECTING/DISCONNECTING ANY INTERNAL ELECTRONIC

COMPONENTS OR INTERCONNECTING WIRING BETWEEN ELECTRONIC

EQUIPMENT, ALWAYS REMOVE POWER AND WAIT AT LEAST 30 SECONDS.

FAILURE TO OBSERVE THESE PRECAUTIONS COULD RESULT IN BODILY

HARM OR DAMAGE TO OR DESTRUCTION OF THE EQUIPMENT.

WARNINGIF USED IN A HAZARDOUS AREA, THE HAZARDOUSAREA MUST BE MADE SAFE PRIOR TO INSTALLATION,REPLACEMENT, OR TROUBLESHOOTING. FAILURE TOCOMPLY COULD RESULT IN PERSONAL INJURY,DEATH, AND/OR PROPERTY DAMAGE.

If a scale is not working properly, find out as much about the problem as possible. Try

to determine whether the problem is constant or intermittent. Mechanical and electricalinfluences can cause malfunctions, so be patient and use sound logic whentroubleshooting.

Check the load cell cable for damage and check all connections for any loose/incorrect

wiring. Examine the physical location of the scale, checking for the following:

Water

Corrosive materials

Unlevel floors

High vibrations

Air currents

Physical damage to the scale

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(3/01)5-2

Isolate the ProblemTo determine whether the problem is in the scale or the digital indicator:

1. Remove power from the system.

2. Disconnect the indicator from the scale, and connect the indicator to a load cellsimulator (analog load cell simulators are available from METTLER TOLEDO).

3. Reapply power. If the problem persists, consult the indicator manual for furthertroubleshooting assistance.

4. If the problem is NOT present with the load cell simulator attached to the indicator,remove power, disconnect the simulator, and reconnect the scale. If the problem

persists, continue troubleshooting the scale.

Check Wiring1. Remove power from the indicator.

2. Make sure that the cable is connected tightly to the load cell.

3. Open the indicators enclosure and make sure that all wiring connections are tight

and that no insulation material is touching the terminal contacts.

4. Check all cable connections for correct wiring. The wiring color codes are given in

Table 5-1.

5. Make sure that the trim resistor is still installed on the white (- Signal) load cell wire.

6. Check all cable connectors and cord grip caps on the indicator. Tighten any looseconnectors.

Load Cell Connection to Indicator

Function Load Cell Wire Color

+ Excitation Pink

+ Sense*

+ Signal Brown

Shield Bare- Signal White

- Sense*

- Excitation Gray

*The load cell does not have a +Sense or Sense wire. You will need to jumper the

indicators +Sense terminal to its +Excitation terminal and jumper its Senseterminal to its Excitation terminal.

Table 5-1: Wiring Codes

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Chapter 5: TroubleshootingCheck Load Cell

(3/01) 5-3

Check Load Cell1. Remove power from the indicator. Disconnect the load cell from the indicator and

check for proper input/output resistances (see Table 5-2).

Measuring Points Resistance

Any lead to shield or ground Infinity

+Exc (Pink) to -Exc (Gray) 1,050 to 1,150 ohms

+Sig (Brown) to -Sig (White) 975 to 1,075 ohms

Table 5-2: Load Cell Measuring Points

2. If resistance is within specification, perform a shorted-signal symmetry test.

Short the signal leads together and place one multimeter lead on the shortedsignals and one lead on the +Excitation wire. Note the resistance value.

Remove the lead from the +Excitation wire and place it on the Excitation wire.The two resistance values should be approximately equal.

3. If the load cell passes the shorted-signal test, reconnect it and reapply power to thescale. Confirm that the proper excitation voltage is reaching the load cell by placing

multimeter leads on the excitation positions of each load cell terminal.

4. If proper excitation voltage is reaching the load cell, check the output signal from

the cell by disconnecting the signal leads and measuring voltage output. If thedead-load output is particularly high or low, the load cell is suspect. The maximum

output possible from any cell is 26.25 mV at 15 VDC excitation and loaded togross capacity.

5. If the load cell has an unusual signal, remove all load from the cell.

With the power on, measure the output from the load cell. The no-load zero

output should be 1.5% of the full scale output. For example, if the excitationvoltage is 15 VDC, then the full scale output would be 30 mV and the no-load

zero output should be within 0.45 mV.

6. If the load cell fails any of the above tests, replace it.

Check Mechanical

ComponentsBecause the 0970C scale design is so simple, only a few mechanical components

require troubleshooting. Check the following:

Check the scale to make sure no parts are bent or worn.

Make sure the loading plate is level and does not bind with the surroundingstructure.

Check the overload stop gaps.

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(3/01)5-4

Load Cell Replacement

ProcedureRemove Load Cell

1. Remove power to the indicator and disconnect the load cell cable from the

indicator.

2. Use a 16-mm hex socket wrench to remove the jam nut and lock washer.

3. Lift the loading plate off the load cell mounting bolt.

4. Use a 5-mm hex Allen wrench to remove the mounting bolt from the load cell.

5. Turn the mounting plate upside down, and then use a 5-mm hex Allen wrench to

remove the three screws that hold the load cell to the plate.

Figure 5-1: Load Cell Replacement

Jam Nut

Lock Washer

Loading Plate

Mounting Bolt

Load Cell

Mounting Plate

Screws

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Chapter 5: TroubleshootingLoad Cell Replacement Procedure

(3/01) 5-5

Install New Load Cell

1. Position the new load cell on the mounting plate so that the three holes in the

bottom of the load cell line up with the holes in the mounting plate.

2. Insert the three screws and tighten them with a 5-mm hex Allen wrench to fasten the

load cell to the mounting plate. Torque the screws to 17 ft-lb.

3. Apply Loctite (242 or better) to the threads on the lower part of the mounting bolt,

and insert the bolt into the opening in the center of the load cell. Tighten the boltwith a 5-mm hex Allen wrench.

4. Position the loading plate so that the hole in the center of the plate fits over the topof the mounting bolt. The overload stop screws should be pointing down toward the

mounting plate, and the loading plate should be aligned with the mounting plate.

5. Place the lock washer and jam nut on the mounting bolt and tighten the nut with a16-mm hex socket wrench to fasten the loading plate to the lower scale assembly.

6. Make sure the overload stop gaps are set to 1/16" (1 mm). If the stop gaps need tobe adjusted, loosen the jam nuts with a 10-mm hex wrench, adjust the stops with a

screwdriver, and then retighten the jam nuts. See Figure 5-2.

7. Position the scale on the cabinet or support structure and make sure that theloading plate is level.

8. Reconnect the load cell cable to the indicator and power-up the indicator.

9. Recalibrate the scale.

Figure 5-2: Overload Stop Gaps

Jam Nut

Overload Gap

1/16" (1 mm)Overload Gap

1/16" (1 mm)

Adjust Stop Gapswith Screwdriver

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Chapter 6: Service Parts0970C Gas Cylinder Scale

(3/01) 6-1

6 Service PartsRefer to the following drawing and table when ordering parts for a Model 0970C gascylinder scale.

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(3/01)6-2

0970C Gas Cylinder

Scale

Figure 7-1: 0970C Gas Cylinder Scale Parts

2

1

34

5

6

9

8

7

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Chapter 6: Service Parts0970C Gas Cylinder Scale

(3/01) 6-3

Ref. No. Part Number Description Qty.

1 TB600935-050 250-kg Load Cell, OIML C3, Ex, FM, SS, 5-meter cable 1

2 MZ0901020116 Hex Nut, M10, Stainless Steel 1

3 MZ0901030117 Lock Washer, M10, Stainless Steel 1

4 TA601022-SS Loading Plate, Type 304 Stainless Steel 1

5 MZ0901020115 Hex Nut, M6, Stainless Steel 4

6 MZ0901010548 Set Screw, M6 x 1 x 35 mm long, Stainless Steel 4

7 TN601023 Mounting Bolt, M10 x 1.5, Stainless Steel 1

8 TA601021-SS Mounting Plate, Type 304 Stainless Steel 1

9 MZ0901010543 Socket Head Cap Screw, M6 x 1 x 10 mm long, Stainless Steel 3

Table 7-1: 0970C Gas Cylinder Scale Parts

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Chapter 7: Reference MaterialReference Drawings

(3/01) 7-1

7 Reference Material

Reference Drawings

General Dimensions Control Drawing

TB600918 TA800818

Table 7-1: Reference Drawings

Recommended Spare

Parts

Qty. Part Number Description

1 TB600935-050 Load cell

3 MZ0901010543 Load cell mounting screw

1 TN601023 Loading plate mounting bolt

Table 7-2: Recommended Spare Parts

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METTLER TOLEDO

Publication Suggestion ReportIf you have suggestions concerning this publication, please complete this form and fax it to (614) 841-7295

Publication Name: METTLER TOLEDO 0970C Gas Cylinder Scale Installation and Service Manual

Publication Part Number: 16182500A Publication Date: 3/01

PROBLEM(S) TYPE: DESCRIBE PROBLEM(S): INTERNAL USE ONLY

Technical Accuracy Text Illustration

Completeness Procedure/step Illustration Definition Info. in manualWhat information is Example Guideline Feature

missing? Explanation Other (please explain below)

Info. not in

manual

ClarityWhat is not clear?

SequenceWhat is not in the right

order?

Other CommentsUse another sheet for

additional comments.

Your Name: Location:

Phone Number: ( )

Mettler-Toledo, Inc. Printed in USA 14981600A

Fax this completed form to METTLER TOLEDO at (614) 841-7295

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METTLER TOLEDO1900 Polaris ParkwayColumbus, Ohio 43240 USA

P/N: 16182500A

(3/01)

METTLER TOLEDO is a registered trademark of Mettler-Toledo, Inc.

2001 Mettler-Toledo, Inc.

Printed in USA

16182500A

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